Conduit



R. P. PERRY.

CONDUIT.

APPLICATION FILED Aus.26, 1913.

1,382,740. Patentgd June 28,1921.

INVENTOR ATTORNEY UNITED STATES PATENT OFFICE.

RAY P. PERRY, OF "UPPER MONTGEAIR, NEW JERSEY, ASSIGNOR TO THE BARRETTCOMPANY, A CORPORATION OF NEW JERSEY.

CONDUIT.

To all whom it may concern Be it known that I, RAY P. PERRY, a citizenof the United States, residing at Upper Montclair, in the county ofEssex and State of New Jersey, have invented certain new and usefulImprovements in Conduits, of which the following is a specification.

This invention relates to the process. of producing conduits or hollowarticles and the )roducts thereby obtained.

T e object of the invention is to produce a conduit containing mixedfibrous and was terproofing materials which is substantially homogeneousand impervious to water, which shall possess good wearing qualities anda considerabledegree of strength and rigidity, and which shall becapable of being cut into various lengths to be used for differentpurposes.

In practising comminuted waterproofing material such as pitch, asphalt,resin, etc., may be mixed with a watery pulp of'fibrous material andthis mixture formed into a sheet upon an ordinary felt or paper-makingmachine. After the sheet has been. formed and partially or entirelyfreed from water, it may be wound upon a mandrel, for example, to form ahollow cylinder having a wall of the desired thickness which thicknesswill depend upon the thickness of the sheet and the number of sheetserves to give convolutions. After the cylinder is formed, it issubjected to high heat and pressure whereby the successive convolutionsare intimately joined together thus forming a hard and densifiedvproduct. The union of the convolutions is greatly promoted by the particles of waterproofing material which become fused by the heat andeffectively cause them to' become intimately united. The fibrousmaterial distributed throughout the more strength and rigidity to theproduct than could be obtained by using fibrous or waterproofingmaterial alone.

The invention will be readily understood by reference to theaccompanying drawings in which, 7

Figure 1 is a view showing the sheet coming from a paper-making machineand being wound up;

Fig. 2 is a view showing how the cylinder may be heated and compressed;and

Fig. 3 1s a view showing another way of heating and compressingthe-cylinder.

Specification of Letters Patent.

this invention a quantity of.

Patented June 28, 1921.

Application filed August 26, 1918. Serial No. 251,536.

of the same into the paper-making machine- Where it is formed into asheet on the cylinder 0 and passes out along the blanket 1 as indicated.Any other suitable means may be used for forming the sheet, thepapermaking machine being indicated merely for illustrative purposes.The amount of water proofing material may vary from to 90% or more ofthe weight of the water free content of the finished material, and willpreferably be introduced in the form of filaments or shot when anordinary papermaking machine is used.

The sheet 2 passes over the suction box 3 where a portion of the wateris extracted, and then passes between the rollers 4 where more of thewater is squeezed out. From the squeeze rolls 4 the partially driedsheet 2 may be wound up into a cylinder 5. upon a mandrel M, or formedinto a cylinder in any other convenient manner so that the successiveconvolutions are in contact with each other. When a sufficient number ofturns have been taken to produce a cylinder 5 having the desiredthickness, the sheet 2 is severed and the cylinder 5 is dried and thensubjected to heat and pressure which serves to fuse or melt thewaterproofing material so that the convolutions become joined togetherand the material becomes greatl densified. 4

Di erent means may be used for heating and compressing the cylinder 5 todensi'fy the same and unite the convolutions. The ones shown in Figs. 2and 3 are for illustrative purposes' a In Fig. 2, the cylinder 5 uponthe mandrel 6 is shown surrounded by a number of pressure rollers 7which cause the layers to become united to produce a substantiallyhomogeneous cylinder. The mandrel M and rollers 7 may be heated byheatin means indicated at 8, and the mandrel will be of such strength asto sustain thecompressive force. of the pressure rollers 7, as thecylinpressed while being revenient manner after the heating andpressingloperation is completed.

. any modifications of the details of the invention will suggestthemselves to those skilled in the art. he sheet 2 may be made only afew hundredths of an inch thick, and few or many convolutions may beused for the cylinder 5; the sheet 2 ma be made of different widths toform cylin ers of different lengths; the diameter of the mandrel M maybe varied through a very wide range so as to produce cylinders ofdifferent sizes; mandrels of different. shapes such as square,rectangular, etc., may beused and may be made to bulge out in the middleso as to produce hollow articles somewhat in the shape of barrels, .asthe sheet 2'will conform closely to the outline of the mandrel uponwhich it is wound; the beginning and end of a sheet 2 which forms thecylinder- 5 may have a larger proportion of waterproofing material thanthe middle portion, thus producing a cylinder having a smallerproportion of waterproofing material in the interior than near the inneror outer surface;

the water may be entirely or substantially entirely dried out of thesheet 2 before it is wound up, or the sheet 2 may be wound up in a wetor damp state; and additional waterproofing material in liquid orcomminuted form may be applied to the surface of the sheet 2 as it isbeing wound up.

Some of the essential differences between this invention and thatdisclosed in my coending application Serial No. 194,77 5 filed ctober4,1917, are that I use heat and pressure in this case to unite thelayers initimately and do 'not find it necessary to saturate thefinished. article with liquid Waterproofing material.

Where the term cylinder is used in the specification and claims it isintended to include bodies which have circular as well asother shapesincross-section, and also bodies whose diameters may be the same or mayvary Claims:

1. As a new article of manufacture, a hollow cylinder containing mixedfibrous and waterproofing materials which have been sufficientlydensified by heat and pressure to produce a substantially homogeneousand rigid product.

2. As a new article of manufacture, a

considerably in different portions.

' rigid cylinder containing fibrous and waterproofing materials, thewaterproofi g mateducing a, hollow cylinder rial being in excess of thefibrous material, said cylinder having been densified by high heatandpressure.

3. As a new article of manufacture, a rigid cylindrical body comprisinglayers of mixed fibrous and waterproofing materials wvhich'have beenintimately united by heat and pressure so as to produce a substantiallyhomogeneous product.

4. As an article of manufacture, a hollow cylinder comprising aplurality'of layers of fibrous and waterproofing materials insubstantially the proportions of one to three,-

which have become intimately united with each other by heat andpressure.

5. As'an article of manufacture, a hollow cylinder composed of aplurality of sheets which have been intimately united by heat andpressure to produce a substantially homogeneous product, said sheets Mcontaining a felted mass of fibrous material and bituminous material inexcess of the fibrous material.

6. The herein described process of pro ducing a hollow cylinder whichcomprises the steps of forming a sheet of mixed fibrous and comminutedwaterproofing material, winding said sheet into a roll, and subjectingsaid roll to heat and pressure so that the bituminous material becomesfused and the convolutions firmly united.

7. The herein described process of producing a hollow cylinder, whichcomprises the steps of forming a sheet of mixed fibrous and comminutedWaterproofing materials, winding said sheet into a roll, and heating andpressing said roll to unite the convolutions.

8. The herein described process of producing a hollow cylinder whichcomprises the steps of providing fibrous material, mixing therewith morecomminuted bituminous material than the weight of the fibrous material,forming a sheet of the mixture, winding said sheet into a roll, andheating and pressing said roll to unite the convolutions.

9. The herein described process of producing a hollow cylinder whichcomprises the steps of forming a sheet of mixed fibrous and comminutedbituminous materials, having a larger proportion of bituminous materialthan fibrous material, winding said sheet to form a cylinder, andsubjecting said and comminuted waterproofing materials on a paper-makingmachine, windingsaid sheet upon a mandrel, and subjecting said woundsheet to heat and pressure so that the bituminous material becomes fusedand the convolutions firmly united.

12. The herein described process of producing a hollow cylinder whichcomprises the steps of forming, as a moist sheet, a

layer of mixed fibers and comminuted waterproofing materials, windingsaid sheet into a roll and drying, heating and pressing said roll tounite the convolutions.

13. The herein described rocess of producing a hollow cylinder w ichcomprises the steps of forming a sheetof mixed fibers and comminutedwaterproofing materials, windlng said sheet upon a mandrel, andSllbjGCtlllg said wound sheet to heat and pressure so as to make themass substan-' tially homogeneous throughout.

14. The herein described process of producing a hollowcylindcr whichcomprises the steps of forming a sheet of paper-making fibers andcomminuted pitch, winding said sheet to form a cylinder, and subjectingsaid cylinder to heat and pressure so that the pitch becomes fused andthe convolutions become united.

In testimony whereof I afiix my signature.

RAY P. PERRY.

